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Siemens 3SU1851-0NA00-2AC2 Metal EMER. STOP Enclosure

Siemens 3SU1851-0NA00-2AC2 Metal Enclosure with Emergency Stop Pushbutton.

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ManufacturerSiemens

Part number3SU1851-0NA00-2AC2

Size 22 mm

Shape Round

Enclosure Material Metal

Enclosure Top Part Yellow

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CAGE: 9NK75

Durable Metal Enclosure 22mm Yellow E-STOP Pushbutton Red 40mm Mushroom Head Rotate-to-Unlatch Reset 1 NC Contact Screw Terminals Protective Collar Floor Mounting

Product description

The Siemens 3SU1851-0NA00-2AC2 is a specialized metal enclosure designed for 22mm round command devices, featuring a yellow top part and a protective collar. This unit houses a red 40mm mushroom E-STOP pushbutton that requires a rotate-to-unlatch action for reset and includes one normally closed (NC) contact. It utilizes screw terminals for reliable electrical connections and is configured for floor mounting with M20 cable entries at the top and bottom.

This enclosure is critical for safety applications in industrial settings, providing immediate access to an emergency stop function. It is essential for machine control, manufacturing lines, and any environment where rapid shutdown capabilities are required to ensure personnel safety and prevent equipment damage.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 3SU1851-0NA00-2AC2. We are committed to providing reliable access to vital industrial automation components. Source your safety components and other automation needs from Stanlo Automation for quality and efficiency.

Technical specifications

Size	22 mm
Shape	Round
Enclosure Material	Metal
Enclosure Top Part	Yellow
Protective Collar	Yes
Control Point	1x Mushroom E-STOP Pushbutton (red, 40mm)
Reset	Rotate-to-unlatch
Contact	1 NC
Terminal Type	Screw Terminal
Mounting	Floor Mounting
Cable Entry	1xM20 top, 1xM20 bottom

Common applications

Industrial Safety Systems

Machine Safety

Emergency Shutdown

Control Panels

Manufacturing Lines

Hazardous Environments

Safety Controls

Compatible systems

Siemens 22mm command devices 3SU1 command device series Industrial safety circuits

Also known as

Siemens 3SU1851 E-STOP Unit 3SU1851 Emergency Stop Enclosure Siemens Red Mushroom Pushbutton

Replaces / compatible with

This unit is part of the Siemens 3SU1 series and serves as a critical safety component. It can replace older or standard pushbutton units where an emergency stop function is required.

Technical note

Expert tip

The rotate-to-unlatch mechanism is a standard safety feature ensuring the emergency stop is only reset intentionally.

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Frequently asked questions

What are the key safety and operational features of the Siemens 3SU1851-0NA00-2AC2?

The Siemens 3SU1851-0NA00-2AC2 features a red 40mm mushroom E-STOP pushbutton with a rotate-to-unlatch reset mechanism and one NC contact. It is housed in a yellow metal enclosure with a protective collar and screw terminals for reliable connections.